Vol. 4, issue 03, article # 6Lukin I.P. Green's functions of a lens-like medium. // Atmospheric and oceanic optics. 1991. V. 4. No. 03. P. 268-271.
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The Green's functions are derived for the parabolic equation of "quasioptics" describing the propagation of optical radiation through a lens–like defocusing medium with a variable focal length. It is shown that the reciprocity does not hold for the Green's functions of a lens–like medium with a variable focal length. It is fulfilled for a lens–like medium with a constant focal length.